Can I be able to fix my status if I marry a citizen but have a DUI which fixed in my record?

Generally, a single DUI conviction six years before applying for naturalization will not stand in the way of eligibility to naturalize. This is true regardless of whether an applicant has taken advantage of the provisions of 245(i) in obtaining Permanent Resident status. Nonetheless, it would be wise to provide to the USCIS a full set of court-certified disposition documents from that conviction. It also would be wise for you to consult with an immigration attorney who, after learning all of the relevant information, could advise about eligibility and strategies, and who could offer legal representation in the often complex application process.